\begin{tikzpicture}[scale=0.8]
	\tkzDefPoints{0/0/A, 2/0/B, 3/0/C,  5/0/D}
	\tkzDrawLine[add=0.1 and 0.3](A,D)
	\tkzLabelLine[pos=1.3,right=1em](A,D){$l$}
	\tkzDrawPoints[fill=black](A,B,C,D)
	\tkzLabelPoints[above](A,B,C,D)
\end{tikzpicture}

